PubMed:32027573 / 1806-1808
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T365","span":{"begin":0,"end":2},"obj":"CD"}],"text":"54"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok396","span":{"begin":0,"end":2},"obj":"CD"}],"text":"54"}